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1. UT Basic/ Advanced > UTB11 Heating Systems > Flashcards

UTB11 Heating Systems Flashcards

1
Q

Which metal is the best reflector of heat?

A

Polished

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2
Q

What type of heating medium is used to produce heat in a unit heater?

A

Hot water

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3
Q

What is the range of the Fahrenheit thermometer between the freezing point and the boiling point?

A

180°

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4
Q

The sum of sensible heat plus latent heat is the definition of what term?

A

Total heat

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5
Q

What principle is the transfer of heat by means of mediums such as water, air, and steam?

A

Convection

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6
Q

What principle is the transfer of heat through space?

A

Radiation

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7
Q

What fuels are most commonly used with heating equipment?

A

Coal, oil and gas

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8
Q

What is the major element present in natural gas?

A

Methane

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9
Q

Butane and propane are part of what group of liquefied gases?

A

Liquified petroleum gas

LPG

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10
Q

How many types of unit heaters are currently utilized in the Seabee community?

A

3

(1) suspended horizontal discharge
(2) suspended vertical discharge
(3) floor- mounted or horizontal type of
blower unit

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11
Q

Unit heaters rated for less than 50,000 BTUs per hour are designated to operate on what systems?

A

low-pressure steam
OR
high- temperature hot water

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12
Q

One kilowatt is equal to how many BTUs per hour?

A

3,415 BTU per hour

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13
Q

Why is the vented gas heater more satisfactory than the unvented type?

A

Less danger of carbon monoxide poisoning

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14
Q

The burning of 1,000 cubic feet of natural gas will produce approximately how many gallons of water?

A

12

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15
Q

What grade of fuel oil is required in oil-fired space heaters?

A

Light

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16
Q

A perforated sleeve burner with its circular fuel vaporizing grooves burns what color flame?

A

Blue

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17
Q

What controls the flow of oil in the pot type and perforated sleeve burners?

A

Float-operated metering valve

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18
Q

A chimney top is required to be how many feet above the highest point of a building?

A

3

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19
Q

What type of piping or tubing is used in oil supply systems to the burners?

A

Copper

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20
Q

Warm-air systems are identified as what types?

A

Gravity and forced-air

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21
Q

What part does the plenum join up with in a furnace?

A

Main trunk duct

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22
Q

What is the result of improperly placed supply diffusers?

A

Air stratification

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23
Q

(True or False) In an individual duct system, each duct is connected directly to the furnace plenum.

A

True

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24
Q

What is a register temperature range of a forced warm-air system?

A

150°F to 180°F

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25
Q

What is the most commonly used airflow design associated with a gas- fired furnace?

A

Upflow highboy

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26
Q

Duct furnaces are mounted in a duct system where air circulation is provided by what?

A

External fan

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27
Q

Along with the return-air compartment and warm-air compartment, what other compartment comprises the gas-fired furnace?

A

Combustion air and fuel

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28
Q

What type of blower is installed in a gas-fired furnace?

A

Centrifugal

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29
Q 
Which piece of equipment is NOT part of the gas burner control?
A. Gas pressure regulator
B. Humidifier
C. Manual gas cock
D. Heat exchanger
A

C. Manual gas cock

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30
Q

What piece of equipment maintains the desired pressure in the burner as long as the gas main pressure is above the desired pressure?

A

Gas pressure regulator

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31
Q

What position does the solenoid gas valve revert to upon a current failure?

A

Closes automatically

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32
Q

How does the design of a recycling solenoid gas valve differ from a standard solenoid gas valve?

A

Allows the valve to switch to manual operation during a power failure.

33
Q

What device is used to produce the electrical current used to operate gas valves?

A

thermocouples and

thermopiles

34
Q

What device shuts off the gas supply when the temperature inside the heating unit becomes excessive?

A

Limit control

35
Q

What device is used to reduce updrafts that are detrimental to pilot or burner operation?

A

Diverter

36
Q

What is the voltage produced by the step-up transformer used in a gas fired furnace?

A

10,000

37
Q

What piece of equipment runs the fuel unit of a gas-fired furnace?

A

Blower motor shaft

38
Q

Which grade of fuel oil is used in a gas-fired furnace?

A

High

39
Q

What device closes the ignition circuits when the thermostat calls for more heat?

A

Primary control

40
Q

(True or False) The limit control is a device that responds to changes in steam pressure in a steam-heating system.

A

False

air pressure vs steam

41
Q

What type of element is used in a vapor-tension device?

A

Highly volatile liquid

42
Q

Other than the snap-action electrical switch, which other electrical switch is often utilized?

A

Mercury

43
Q

What is the nerve center of the heating-control system?

A

Thermostat

44
Q

How far up on the wall should a thermostat be placed, in feet?

A

4-1/2’

45
Q

(True or False) Gas-fired and oil-fired forced-air units, which have the blower below the heating element or combustion chamber, should be set on masonry at least 4 inches thick.

A

False

3”

46
Q

What is the clearance requirement, in feet, of a furnace from wood or other combustible material?

A

18”
or
18’ as per question
this question is stupid

47
Q

One inch of free-air area is required for how many BTUs per hour of furnace input rating?

A

1000

48
Q

What type of material and diameter piping or tubing are required from the oil tank or valve to the burner?

A

Copper, 1/2 inch

49
Q

What size is recommended for all vent lines used in furnace installations?

A

1-1/2”

50
Q

Why are kerosene, diesel oils, and commercial oils of Grades Nos. 1 and 2 suitable for furnace usage?

A

They vaporize at relatively low temperatures.

51
Q

(True or False) Burners using air as the atomizing medium are designed for three air pressure ranges.

A

True

low: 2 psi
med: 25 psi
high: 100 psi

52
Q

At what speed, in rpm, does a cylindrical cup use in a horizontal rotary-cup burner rotate?

A

3,450

53
Q

What is used to remove the air from a burner prior to starting?

A

Petcock

54
Q

Which is NOT a cause for a flame that is raw and stingy in a oil burner?
A. Partly clogged nozzle
B. Air in the pump
C. Too large an opening in air adjustment
D. Improper draft

A

D. Improper draft

55
Q

After the burner flame and draft are properly adjusted, a flue-gas analysis should show a CO2 content of approximately what percent?

A

10%

56
Q

If the furnace is large enough and the burner has been set for correct oil flow and minimum amount of air, stack temperature should not exceed how many degrees?

A

600°F

57
Q

The stack thermometer is used to determine the temperature of gases in what piece of equipment?

A

Smoke pipe

58
Q 
What is a possible problem in an oil pump, if you have no oil flow at the nozzle?
A. Blown seal
B. Air leak in intake line
C. Loose plugs or fittings
D. Bad coupling alignment
A

B. Air leak in intake line

59
Q

What is the disadvantage of using cast iron hot-water heating boilers?

A

Sections cracking

60
Q

How many inches above a finished floor should a low-temperature hot water boiler be?

A

2

61
Q

Where is the pressure-relief valve located on a boiler used in a low- temperature hot water system?

A

Top of the boiler

62
Q

What is another name for the airflow switch used in a low-temperature hot water system?

A

Sail switch

63
Q

(True or False) A one-pipe, open-tank gravity distribution system consists of a single pipe that carries hot water to all of the radiators and then returns it back to the boiler.

A

True

64
Q

The amount of temperature drop between the beginning and the end of the line depends on the length of the main and what other factor?

A

Heating load

65
Q

The relief valve located in a closed pneumatic compression system is set to lift at what water pressure level, in psi?

A

Over 30 psi

66
Q

In the heating of larger installations where more than one building is involved, what type of circulation method is used?

A

Forced circulation

67
Q

Mains and branches are pitched so air in the system is discharged through which device?

A

Radiators

and
open expansion tanks
relief valves

68
Q

How many radiator types are you concerned with as a UT?

A

2
Cast iron
Fin-tubed

69
Q

(True or False) Circulating pumps used in low-temperature hot water distribution systems ensure the positive flow of water regardless of the height of the system or the rise in water temperature.

A

True

70
Q

Where is the reducing valve installed on the boiler?

A

At the same level as top of boiler

71
Q 
Which is a reason why radiators do not heat?
A. Not enough air in the system
B. Insufficient water in the system
C. Clogged fin-tubes
D. Closed radiator valve
A

B. Insufficient water in the system

72
Q

What is the high temperature range for most military and federal heating plants?

A

350°F to 450°F

73
Q

Whose permission is needed to install an HTHW plant that operates above 400°F?

A

Naval Facilities Engineering Command

74
Q

What type of pump is used in an HTHW system?

A

Centrifugal

75
Q

Why is an expansion tank required in an HTHW system?

A

To allow for water expansion when heated.

76
Q

What is the optimal pH range for an HTHW system?

A

9.3 - 9.9

77
Q

Upon completion of an installation of an HTHW system, the entire system is held under what pressure, in psi, for not less than 24 hours?

A

450 psi

78
Q

Generator tubes utilized in HTHW systems are subjected to an ASME test pressure of what value, in psi?

A

900 psi

79
Q

What does HTHW stand for?

A

High temperature hot water systems

1. UT Basic/ Advanced (25 decks)

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